Welcome to America the Voice of America’s News Words.Germany has _________ thousands of travellers at its borders with Austra and the Czech Republic. The checkpoints aim to slow the spread of highly ________ coranavirus varriants first found in Britain and South Africa. Every one must show a ________ COVID-19 test result to enter the country. A coronavirus variant __________ when part of the structure of the virus changes while __________. Over time, it becomes the new variant. More than 4,000 variants have developed from the virus that causes COVID-19, but not all are still __________.